What I liked about Greece was [...] the impressive force of the language itself, unconfined by dictionaries, spoken in the streets, in cafés and in the country. (Peter Levi. The Hill of Kronos. 1980.)

This guide is intended for those editing Greek words in Wiktionary, it is a supplement to Wiktionary:Entry layout explained.
All definitions are written in English, definitions in Greek can be found in the Greek Wiktionary—το Βικιλεξικό. Wiktionary uses the term Greek to refer to Modern Greek, the classical language is referred to as Ancient Greek and it has a separate About Ancient Greek guide. Modern and Ancient forms will often have different diacritical marks and therefore separate entries: as with the Ancient polytonic ὁδός(hodós) and the modern monotonic οδός(odós); but sometimes they will share the same form: as with βαθύς(vathýs) whose entry will have two language headings.

Greek is an inflected language, Wiktionary will eventually include all these forms. The main entry for each word is the lemma form—the form listed in bi-lingual dictionaries. Non-lemma entries will refer back to the lemma form. The usual lemma forms are: for nouns the nominative singular, for pronouns and adjectives the masculine, nominative singular, and for verbs the 1st person singular of the present tense

Not a heading but a line easily seen at the top of a page, for an example see: δουλειά and δουλεία). The see also text forms a links between these confusable terms, the first means work, the second slavery. Similar entries, differing only in capitalisation, hyphenation or diacritical marks are linked in this manner. As an example:

This is the place to list different spellings of the same word, for example the Greek word for brother is spelt in two ways: αδελφός and αδερφός. The dated forms of Katharevousa are still in use and should also be placed here, as seen with άζωτο.

Etymology

Full guidance is given in the article (Wiktionary:Etymology). The correct etymology is not necessarily the obvious one, it is essential that reliable sources are used.

The lemma form (eg κλασικός) will contain the English translations of the word plus all relevant pre-POS and post-POS headings. Entries for non-lemma forms (eg κλασική, κλασικής &#133;) should only contain the Pronunciation and Adjective headings, with if appropriate Alternative forms.

Headword or inflection line

This line immediately follows the POS heading. For lemma forms this should have the extended form shown here with its syntax:

Lemma entries should include a declension table, this table shows the inflected forms of the adjective and may include degrees of comparison. If the correct declension is unknown or time is short add the text:

The lemma form (eg αδελφός) will contain the English translations of the word plus all relevant pre-POS and post-POS headings. Entries for non-lemma forms (e.g., αδελφοί, αδελφών) should only contain the Pronunciation and Noun/Proper noun headings, with if appropriate Alternative forms.

The definition of lemma forms should usually be the English translations of the word, just long enough to define the exact meaning of the English equivalent. The {{label}} template can be used to provide context, as in the monk translation of αδελφός, this template usually places the word in an appropriate category in this case Religion.

Non-lemma forms should usually resemble that found for αδελφοί using the syntax:

Some Katharevousa forms are still in common use. Reference should be made in the Note section of the declension table, see: συντελεστής and λαιμός. Examples of entries can be see at συντελεστού and λαιμόν. Alternatively these forms may be placed under the Related terms heading.

The lemma form (eg γράφω) will contain the English translations of the word plus all relevant pre-POS and post-POS headings. Entries for non-lemma forms (eg έγραψε &#133;) should only contain the Pronunciation and Verb headings, with if appropriate Alternative forms.

Lemma entries should include a conjugation table, this table shows the complete conjugation of the verb, including the indicative, subjunctive and imperative with the imperfective and perfective stems. If the correct conjugation is unknown or time is short add the text:

Conjugation templates for most regular verbs in the active voice are available, and for some regular verbs in the passive voice.

See Category:Greek verb inflection-table templates, for more on their use. Additionally, each individual template contains a description of the arguments required and of the class of verbs it covers. Care should be taken to ensure that the right template is chosen.

Adverbs are not inflected, but have degrees of comparison. Initial entries may use the simple inflection line but when the forms of the degrees of comparison are known they should be entered as shown for βαθιά:

If a See also section is present it should appear at the very top of the page where it will be easily seen by a user who has mistyped, or is uncertain of the spelling of, a search term. It is not a heading and uses the template {{also}}, providing links to words of different meaning but similar spelling. Although words of similar etymology, such as δουλειά (work) and δουλεία (slavery) could appear here, they are more correctly listed under Related terms.

Transliteration or Romanization is a (usually systematic) respelling of a word in Roman/Latin characters, it is intended for those who cannot read foreign alphabets or who lack the necessary fonts. It is not intended to provide a phonetic representation, help in the pronunciation of a word should be placed in the Pronunciation section.

The transliteration of Greek words into romanised forms should appear, in parentheses in the following locations:

Greek transliterations (that is, romanizations) are not Greek words and should not be created as entries. However, some of these romanizations will turn out to be words in other languages, often derived from Greek or Ancient Greek. Thus there is an English entry Katharevousa but not for zestó, the romanisation of the adjective form ζεστό, which is not used in any Latin-script languages.

There is a table of equivalent forms which should be used to identify the equivalent forms used in Wiktionary. Since in some cases (e.g. ο & ω; and η, ι, οι, υ & υι) more than one Greek form equates to one Roman one the process is not reversible. The Roman equivalent was chosen from establised sources and in line with Wiktionary's draft policy.

Stressed vowels should be indicated by the appropriately acute accented Roman one (e.g.: á é í ó ú). Letters with a diaeresis (umlaut) should also get one (ï or ü). There are two exceptions:

With vowel combinations αυ, ευ (and very rarely ηυ) the stress moves from the υ, which becomes v or f, to the preceding vowel. Thus αύ → áf.

When the stress and diaeresis appear together, ΐ, the simple í will suffice.

Koine (Hellenistic or New Testament Greek) – the common (hence Koine) language of the eastern Mediterranean Greek, of Alexander the Great and the New Testament of the Christian Bible), used from say 300 BC until AD 300.

Wikipedia has a section on the Greek alphabet, Modern Greek uses the monotonic system with a single stress accent in nearly every word of more than one syllable; in contrast the polytonic system used for Ancient Greek entries has multiple diacritical marks. Accents are not used in abbreviations (e.g. ΕΣΣΔ) and words written in upper case such as ΗΛΙΟ (cf ήλιο); in contrast, words that begin with a vowel which is stressed should carry an accent (e.g. Έλληνας). Greek numerals use the usual Greek alphabet together with three extra symbols ϛϟϡ.

Your windows Help should provide information (Searchword = language). Wazu Japan has a web site where you can check whether your browser is displaying all the Greek characters and provides downloads of necessary fonts. Wikipedia has an article on the Greek keyboard layout.

You may need to set up your PC to write and display Greek:

Click the on screen Start menu button and select Control panel (on some menus you may have to click Settings to be offered this option).

Click the Language bar and Key settings to choose your preferences under those headings.

Greek keyboard layout (AltGr keys in blue sometimes available)

A Greek keyboard utility is available, the Microsoft Visual Keyboard can be
downloaded, or searched for. This provides a large on-screen indication of which alphabet is active on a PC and the layout of the keyboard.